docs: def partition_pairs(neurites, neurite_type=NeuriteType.all):
      '''Partition pairs at bifurcation points of a collection of neurites.
      Partition pait is defined as the number of bifurcations at the two
      daughters of the bifurcating section'''
      return map(_bifurcationfunc.partition_pair,
                 iter_sections(neurites,
                               iterator_type=Tree.ibifurcation_point,
                               neurite_filter=is_type(neurite_type)))